AttributeError: 'list' object has no attribute 'split'

[Torxed]

Crash Report

I suspect this is another one for #10201.
Mainly because I'm using Python v3.10.1 and this worked a few versions ago.
While running a github workflow, mypy crashes using mypy --module x --strict.

Traceback

This traceback is from the .github workflow execution:

Run mypy --strict --module ourkvm
Traceback (most recent call last):
  File "/usr/sbin/mypy", line 33, in <module>
    sys.exit(load_entry_point('mypy==0.930', 'console_scripts', 'mypy')())
  File "/usr/lib/python3.10/site-packages/mypy/__main__.py", line 12, in console_entry
    main(None, sys.stdout, sys.stderr)
  File "/usr/lib/python3.10/site-packages/mypy/main.py", line 70, in main
    sources, options = process_options(args, stdout=stdout, stderr=stderr,
  File "/usr/lib/python3.10/site-packages/mypy/main.py", line 919, in process_options
    parse_config_file(options, set_strict_flags, config_file, stdout, stderr)
  File "/usr/lib/python3.10/site-packages/mypy/config_parser.py", line 207, in parse_config_file
    updates, report_dirs = parse_section(
  File "/usr/lib/python3.10/site-packages/mypy/config_parser.py", line 400, in parse_section
    v = ct(section.get(key))
  File "/usr/lib/python3.10/site-packages/mypy/config_parser.py", line 129, in <lambda>
    'exclude': lambda s: [p.strip() for p in s.split('\n') if p.strip()],
AttributeError: 'list' object has no attribute 'split'
Error: Process completed with exit code 1.

To Reproduce

This is the following workflow file I'm using:

on: [ push, pull_request ]
name: mypy type checking
jobs:
    mypy:
        runs-on: ubuntu-latest
        container:
            image: archlinux:latest
        steps:
            - uses: actions/checkout@v2
            - run: pacman --noconfirm -Syu python mypy python-pip
            - run: python -m pip install --upgrade pip
            - run: pip install fastapi pydantic
            - name: run mypy
              run: python --version
              run: mypy --version
              run: mypy --strict --module ourkvm

Your Environment

• Mypy version used: 0.930 (v0.910 worked)
• Mypy command-line flags: -m project --strict
• Mypy configuration options from mypy.ini (and other config files):

[tool.mypy]
python_version = "3.10"
exclude = ["tests/", "test.py"]

[[tool.mypy.overrides]]
module = "fastapi_resource_server.*"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "psutil.*"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "systemd.*"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "uvicorn.*"
ignore_missing_imports = true

• Python version used: 3.10.1
• Operating system and version: Arch Linux (latest)

[Torxed]

Pretty convinced this is just exclude = ["tests/", "test.py"] not being supported any longer.
Been working great before and depending on which examples you find they tell you to specify this differently.

And using the mypy configuration syntax doesn't work either:

[tool.mypy]
python_version = "3.10"
exclude =
    ^tests\/$
    ^test\.py$

Until I figure out what the new syntax should be.
I can work around it with exclude = "tests" and that avoids the test folder at least.

[A5rocks]

For what it's worth, you may wish to follow the progress of #11828 (Though it looks like you want a multiline string for 0.930)

[Torxed]

Yepp that looks like it will bring back the list support for exclude.
Thank, subscribed.

[Amund211]

Ran into this myself. As @A5rocks said, this is fixed by #11828, which is now released in 0.931 as of Jan. 7.

[hauntsaninja]

Yup, the solution here is using 0.931